No Tach Filter! Problem?
Thread Starter
Racer
Joined: Mar 2008
Posts: 487
Likes: 48
From: Ocala Florida
No Tach Filter! Problem?
I have a '76 with the original 350 although it was sent out and rebuilt a couple years ago. It has never had a tach filter and didn't seem to be a problem. I replaced all the original gauges with aftermarket including the tach and speedo. That was about a year ago or so. Yesterday I was driving and the tach just quit working. Dropped down to about 500 and bounced there. At idle it shows nothing at all. I looked for a fuse but can't find one that has tach on it.
Any ideas? Do I need to put a filter on it?
Thanks
Barry
Any ideas? Do I need to put a filter on it?
Thanks
Barry
Former Vendor
Joined: Aug 2006
Posts: 76,656
Likes: 1,852
From: Jeffersonville Indiana 812-288-7103
St. Jude Donor '08-'09-'10-'11-'12-'13-'14-'15
Hard call there.. I'd always run one. But you have an aftermarket tach I assume and something has probably spiked the board inside. The problem is (and judging from your post) you have an aftermarket tachometer so you'll need to contact the manufacturer and see if the tach requires a filter.
If you have a factory tachometer in the car the you probably just need a board to fix the issue... The basic function of the filter is to prevent spikes and to knock the edge off the square signal generated by the distributor. The factory board and our reproduction board will read either a square or rounded signal so this explains why you never had an issue until now.
-Willcox
If you have a factory tachometer in the car the you probably just need a board to fix the issue... The basic function of the filter is to prevent spikes and to knock the edge off the square signal generated by the distributor. The factory board and our reproduction board will read either a square or rounded signal so this explains why you never had an issue until now.
-Willcox
Thread Starter
Racer
Joined: Mar 2008
Posts: 487
Likes: 48
From: Ocala Florida
Yea it is aftermarket. I put all autometer gauges in sometime ago. Wouldn't happen to be the ground would it? Is there a way to check to make certain there is a signal going to the tach?
Former Vendor
Joined: Aug 2006
Posts: 76,656
Likes: 1,852
From: Jeffersonville Indiana 812-288-7103
St. Jude Donor '08-'09-'10-'11-'12-'13-'14-'15
I wish I could be of more help...
Willcox
